Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Tax provision (benefit) for recognized net actuarial loss (gain)	$ 110	$ 105
Tax provision (benefit)	$ (106)	$ 206
Common Shares [Member]
Issuance of common shares	126,911	83,391	78,730
Common Shares Issued to Rabbi Trust [Member]
Common shares distributed from rabbi trust	2,268	2,248	22,370
Deferred Compensation Liability [Member]
Common shares distributed from rabbi trust	2,268	2,248	22,370
Paid In Capital [Member]
Issuance of common shares	126,911	83,391	78,730
Retained Earnings [Member]
Cash dividends declared per share	$ 0.8	$ 0.8	$ 0.8
Treasury Stock [Member]
Purchase of common shares	135,518	73,514	73,460